GENERAL DESCRIPTION
The AD8155 is an asynchronous, protocol-agnostic, dual-lane 2:1 switch with a total of six differential CML inputs and six differential CML outputs. The signal path supports NRZ signaling with data rates up to 6.5 Gbps per lane. Each lane offers programmable receive equalization, programmable output preemphasis, programmable output levels, and loss-of-signal detection.
The nonblocking switch core of the AD8155 implements a 2:1 multiplexer and 1:2 demultiplexer per lane and supports independent lane switching through the two select pins, SEL[1:0]. Each port is a two-lane link. Every lane implements an asynchronous path supporting dc to 6.5 Gbps NRZ data, fully independent of other lanes. The AD8155 has low latency and very low lane-to-lane skew.

FEATURES
   Dual 2:1 mux/1:2 demux
   Optimized for dc to 6.5 Gbps NRZ data
   Per-lane P/N pair inversion for routing ease
   Programmable input equalization
      Compensates up to 40 inches of FR4
   Loss-of-signal detection
   Programmable output preemphasis up to 12 dB
   Programmable output levels with squelch and disable
   Accepts ac-coupled or dc-coupled differential CML inputs
   50 Ω on-chip termination
   1:2 demux supports unicast or bicast operation
   Port-level loopback
   Port or single lane switching
   1.8 V to 3.3 V flexible core supply
   User-settable I/O supply from VCC to 1.2 V
   Low power, typically 2.0 W in basic configuration
   64-lead LFCSP
   −40°C to +85°C operating temperature range

APPLICATIONS
   Low cost redundancy switch
   SONET OC48/SDH16 and lower data rates
   RXAUI, 4× Fibre Channel, Infiniband, and GbE over
      backplane
   OIF CEI 6.25 Gbps over backplane
   Serial data-level shift
   2-/4-/6-lane equalizers or redrivers